Multiple-weave motion for loom dobbies



W, H. WAKEFIELD MULTIPLE WEAVE MOTION FOR LOOM DOBBIES March 15, 1927. 1,621,045

' Filed June 21, II26 Patented Mar. 15, 1927.

mime WAKE-E519, or Home -res. eassessment Assmuo TQYQEOMHQN M ILrI L -wseva mrmn Loon: Beetles.

Application filed June 21, 19.26. Serial No. 117,291.

This invention relates to improvements in multiple weavemotions for looms and it is the general object of theinvention to provide a continuously running auxiliary pattern chain with indicating levers which are attached by flexible connections to another set of levers controlled by the main pat tern chain whereby when desired thefeffect of the first or auxiliary chain can be nullified to permit a control of the harnesses by the main pattern chain.

The invention relates more particularly to the type of dobby set forth in'patent to Selley No. 955,559. In the motion disclosed in said patent there is provided an upper constantly moving auxiliary cylinder having a pattern chain to actuate a set of auxiliary levers which are flexibly connected to a lower set of levers raised and lowered by the main pattern chain. The connections shown in said patent are such that the harnesses and lower levers -which are attached to the upper levers cannot be used except as they are called into action the upper levers or except as the non-peggingof the-upper chain will permit lifting ofthe lower. fin ersh For this reason it is impossible orall practical purposes to use those levers of the lower set which are assigned to the upper set and it is an important object of my invention'to' provide a device which will ordinarily lengthen the path traversed by the cords which connect the upper and lower levers so that when the device is operative the lifting of an upper lever will raise the corresponding lower lever, but when said device ismove'd tov slacken theycord the upper lovers can move without producing any effect on the lower levers, thereby freeing the latter to be acted upon by another pattern surface having a weave or box indication different from that of the'upper chain.

With these and other objects in view which will appear as thede'scription proceeds, my invention resides in the combination "and arrangement of parts hereinafter described and set forth in the claims.

In the accompanying drawings wherein I have shown a convenient embodiment of'my invention,

. Fig. 1 is a front elevation of a dobby locatedat the left hand end of loom and having my invention applied thereto,

Fig. '21s a side elevat on taken in the direction of arrow 2, Figl'l, the cylinders being shown in section and the pattern chain being removed for the sake of clearness, Fig.3 1s a vertical section on line 83 of Eiga' 2, certain par-ts being omitted for the sake of clearness,

Fig. i is an enlarged fragmentary vertic-a1 section taken on line 4. -4 of Fig.3, and

Fi 5 is a detail view showin the con- I c D e5 troller forthe cords taken in'the directicin of arrow 5, Fig. 2.

Referring to the drawings the dobby frame 10'ha's journaled therein a shaft 11 on the front and rear ends of which'are se- I cured rocker arms 12 one of which is shown in the drawings. The lower portion of said frame 10 has journaled therein a shaft 13 to which is-secured the lower ormain-chain cylinder 14 having'a pattern chain-15. ratchet wheel lfi secure'dto the shaft 13 has teeth disposed in such a direction as tocause angular movement of the shaft when the rocker arm v12-meves ina counterclockwise direction through the action of pawl 17. Said'pawl is pivoted'to the rocker arm tance equal to one space on the pattern cha n 15 on alternate picks of the loom.

'80 at 18 and will move the cylinder-for a dis}- The mechanism for determining -whether pawl 17 shall-be operatively disposed with regard to ratehet 16 includes a pin 19 ex tending laterally from the pawl and lyin over a lifter wire 20, the outer or left han end of which as shown in Fig; l'is mounted on a lug 21 projecting-forwardly from a special lever 22 pivotedon a shaft 23 secured in the dobby frame. 'Said lever 22-is posi tioned to be acted upon by a portion of the main pattern surface. The other end of wire 20 is supported on'a stud 2i extendingforwardly from the inner end of a lever 25 pivoted as at 26 to the loom frame and connected by a link 27 to a lifting lever 28 pivoted to the upper part ofthe dobby frame.

The position of the lifting lever is determined by an auxiliary single space multiplier chain 29 carried ona sprocket 30 keyed or otherwise secured. to a shaft 31 to which is also secured the upper auxiliary cylinder 32 The shaft 31 receives a regular angular motion during the operation of the loom, this motion being either intermittent or continuous and may be given as set forth in the aforesaid patent. It is sufiicient for the purposes of the present description to state that the cylinder 32 will receive an angular motion every second pick of the loom so that the pattern chain 34 carried thereby will present a new bar under the auxiliary levers 85 every second pick of the loom..

A lower or main set of levers 36 lies over the chain and will be controlled as to understood, to the dobby hooks (not shown) which actuate the harness frames of the loom in connection with vregularly but oppositely reciprocating dobby knives (not shown). These cords correspond to the wires performing a similar function in the aforesaid patent. 1

The pattern chain 29 is provided as shown herein with one high ball 38 which will raise lever 28 once for each revolution of chain. 29, the motion being accompanied by a downward motion of the stud 2 1' and the inner end of wire 20. If this motion coincides with a blank space on the lower chain under lever 22 then wire will be in its lowest position and will permit pin 19 and therefore pawl 17 to move clownwardy so that the latter will be able to move the chain 15. The operation of the matter thus far described is the same as that set forth in the aforesaid Selley patent and a further description of the same is con,-

sidered unnecessary.

In carrying out my improvements I pro- -vide means for acting on the cords 37 so therethrough a. tensioning rod which is held in proper longitudinal position by a set screw 56. Said rods 55 are slidable 111 the arms 5 1 so as to be operatively disposed with regard to a greater or lesser number of the cords 37 according to the conditions of any particular weave or box sequence. A light wire 57 extends between the ends of the rods 55 to prevent the cords when slack from passing out'of control of the rods.

The tensioning member 51 is provided with a weighted arm 58 which lies over a finger 59 formed on a control lever 60 pivoted on the shaft 23 and extending over the ends of bars 61 of the chains 15, certain of said bars having a clip 62 positioned to raise the control lever 60. The cords 37 of the selected control levers are passed to the left of the upper rod 55 and to the right of the lower rod and between the rocking member 54 and the wire 57.

The cords 37 are longer than the distance between the points at which they are connected to the upper and lower levers and 86 when said levers are both either raised or lowered and when it is desired to control those harnesses or boxes corresponding to the lower levers 36 which are shown to the right of Fig. 2 by the upper cylinder the tensioning device will be'in the position indicated in Fig. 3, being moved to that position by lever60 which has been raised by the clip 62. In this position the paths traversed by the cords 37 are such that there is no slackness in said cords and any upward movement of the levers 35 will be immediately communicated to the corresponding lower levers 36. When it is desired to take the lower levers 36 out of control of the upper cylinder an ordinary dobby bar 61 without the clip 62 will be presented under the lever 60 and the latter will move down and the tensioning device will rock to the position indicated in Fig. 1. In this latter position the rods 55 are practically in alignment with the points of attachment of the cords with the levers so that said cords are slack as indicated in Fig. l. When in this position the upper levers 85 may continue to be raised by they will serve only to use up the slack of the cords and will not be able to raise the The latter are therefore conlower levers.

chain 15 independently trollable by the main of the upper chain- I It is to be understood that there willbe as many clips 62 as there are bars on the lower chain 15 which are not pegged to c011 trol the end lower levers and that there will be as many bars on the lower chain 15 'without clips as are pegged for the lower In other words, any of the bars of 4 levers. the lower chain which control all of the lower levers 36 will be .made without the clip. 7 The harness frames which' may be controlled by the upper chain are usmilly devoted to the side portions of such fabrics as handkerchiefs where the border runs continuously from one end of the fabricto the other. The chain illustrated in F 11. for the bottom cylinder has twelve bars double index which corresponds to twenty-four picks of the loom. As shown in said figure the upper auxiliary chain is ineffective to control the harnessframes, there being six bars without clips to provide twelve picks of one type of weft, for-instance twill, which is pegged on the lower chain, and there are also six bars of'thelower chain provided with clips-62 which account for twelve picks to be controlled by the upper cylinder to' produce another weavesuch, for instance, as a satin; The chains illustrated herein arevery short but can be lengthened to carry out theprinciples described. e i

If desired the multiplier control effected by chain 29 maybe omitted as has been done herctofore in actual practice, but in such'a case the upper cylinder would still continue to receive a regular angular motion throughout the operation of the loom, the purpose of illustrating said cha-in 29being to indicate that the invention .set forth herein can be used in connection with a multiplier chain.

' VVhile I have described the device in connection. with a multiplicity of weaves, yet it is to be understood that the device is equally applicable to the control of boxes on box looms where the. boxes are controlled by certain jacks of the (lobby, that is, the device can be used to control either harness fl -tunes or boxes when these devices are controlled by the lower fingers 36, hen applied to boxes the invention is applicable to fabrics employing a crepe weave in con.-

nection with other weaves, such as twill, satin, or plain. When so used the upper cylinder can be pegged to keep one box active for two picks anl then another box active for two picks, alternating this control so long as crepe is being woven, this control being accomplished when the tensioning device is in the position indicated in Fig. 3. After the crepe part of the repeat has been. completed and it is desired to pass to another part of the repeat the tensioning device may be moved to the position indicated in Fig. 1, thus rendering the top cyl inder ineffective even though the same continues to give its indications. The control, passing to the lower cylinder, makes it possible to peg the lower chain so as to call any other boxes including those which are controlled by the top cylinder. On a 4 x .1 loom for instance, there would be two of the cords 37 assigned to boxes and controlled by the tensioning devices.

From the foregoing it will be seen that I have provided a very simple means for transferring thecontrol of a selected set of lower levers from one to another cylinder merely by tightening or slackening the flexible connections betweenthe upper and lower levers. The rods 55 are slidable in their bearings so as to embrace a varying number of cords depending upon the number of harnesses which are to be given over to the side portion of the fabric being woven, and when it is desired to use the loom to weave a fabric which does not require the alternate control of certain of the levers 36 vfective or an angularly pairs, each said rods maybe'removedso that the top fingers will not; be effective to interfere with in the art without departingI'from the spirit andscope of the inventioin'and I do not wish to be llmitedto the details herein dis= 7 closed but what I claim is:

1. In a multiple weave motion for pattern mechanism, a main pattern chain, a main :set of levers therefor, asecond pattern chain, a second set of levers therefonfiexihle connections between certain of the first. named levers and certain of the second named levers, and means to'tighten or slackensaid connections to -render the second levers cf ineffective, depending upon whether the connections are tight or slack, to control the first named levers; Y *2. in a multiple weave mot'on for pattern mechanism, a main-pattern chain, a mainset of levers therefor; a second pat-tern chain, a

second set of'levers therefor, flexible con.- nections between certain of the. first named levers and certain of the second named levers, a rockingleverunder 7 pattern'chains to vary the length of the path traversed by the flexible connections to the end that. when said path is lengthened the second named set of leversis effective. and when said path is shortened said second named set of lovers are ineffective to control.

the first named set of levers. V

3. In a multiple weave motion for pattern mechanism, a main pattern chain, a main set of levers therefor, a-second pattern chain, a second set of levers therefor, flexible connections between certain of the first named levers and certain of the second named levers, movable device engaging opposite sides of the flexible connections and under control of one of the pattern chains to slacken or tighten said flexible connections, the second named levers controlling the first named levers when said connections are tightened and moving without effect on the first named levers when said connections are slackened. I

4. In a pattern mechanism for looms, a main pattern surface, a main set of levers for the pattern surface, an auxiliary pattern surface receiving an angular movement regularly during the operation of the loom and independently of the motion of the main pattern surface, a set of auxiliary levers for the auxiliary pattern surface, and flexible conmain lever, and means under control of one of the pattern surfacesto render the auxllcontrol of one .of the pair having an auxiliary and a,

iary leversinefl'ective during a part of the operation of the loom to control the main levers and to render said auxiliary levers effective during another part of the operation of the loom to control the main levers, said main and auxiliary levers moving at all times about fixed centers vwhen actuated by the pattern surfaces.

5. In a device of the class described, a main cylinder, a pattern surface carried thereby, a main set of levers for the pattern surface, a second cylinder receiving a regular movement duringthe operation of the loom independent of the movement of the main cylinder, an auxiliary pattern surface for the auxiliary cylinder, a set of auxiliary levers for the auxiliary pattern surface, flexible connections between the main and auxiliary levers connecting said levers in pairs ,so that each pair has one main and one auxiliary lever and means to cause the flexible connections to traverse a lengthened path during a portion of the operation of the mechanism to'place the main lever of each pair under the control of the auxiliary lever of the same pair, said means being movable to cause the flexible connections to traverse a shorter path in orderto render the auxiliary lever of each pair ineffective to control the mainlever of the corresponding pair.

6; Inv a device of the class described, a

main pattern surface, a main set of levers for the pattern surface, an auxihary pattern surface receiving an angular, movement regularly during the operation of the loom and independently of the motion of the main pat tern surface, a set of auxiliary leversfor the auxiliary patterncsurface, and flexible connections between the main and auxiliary leversconnecting said levers together inpairs, each pair having an auxiliary and a main lever, and a device operatively associated with the flexible connections and undercontrol of one of the pattern surfaces and defining a longer path along which the flexible connections move when in one position than when said device is in another position, the auxiliary lever controlling the corresponding main lever when the path is long and the and means to take up the slackness of the connections to cause the main levers to be under control of the second set.

In testimony whereof I have hereunto af-.

fixed my signature.

WALTER H. WAKEFIELD. 

